Just recently I have had to log in again each and every time I visit the site. Previously, as long as I did not reboot my computer, I remained logged in here and could re-visit repeatedly without having to log in tediously every time. At this point I am not certain, but I suspect it is a site problem rather a glitch with my computer, because I do not have the same issue at any other sites.

I'm using Firefox and I occasionally have to re-login, maybe 10% of the time. Whether it's accurate or not, I've just assumed the website has rebooted itself for any number of reasons while I was logged off.